JP2871342B2 - Filter regeneration device for internal combustion engine and control method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for regenerating a filter for an internal combustion engine that collects particulates (particulate matter) contained in exhaust gas discharged from a diesel engine.

[0002]

2. Description of the Related Art The high economic growth of so-called developed countries such as Europe, the United States and Japan has greatly contributed to civilization on the earth.
However, waste of fossil fuel energy, centered on economic growth in developed countries, has polluted the Earth's atmosphere.

[0003] With respect to global environmental conservation, measures against global warming, that is, measures for reducing CO2, have been highlighted recently, but measures against acid rain that causes deforestation cannot be ignored.

[0004] Acid rain is a natural phenomenon caused by air pollutants such as sulfur oxides and nitrogen oxides as a polluting source.
There is a trend to strengthen stationary sources such as generation and mobile sources such as automobiles. In particular, regulations relating to automobile exhaust gas have been shifted from conventional concentration regulations to total quantity regulations, and the regulation values themselves are about to be significantly reduced.

[0005] Among automobiles, diesel cars are subject to stricter regulations on particulate emissions as well as nitrogen oxides. It is said that it is impossible to achieve the exhaust gas regulation value only by conventional measures for reducing pollutants in exhaust gas by improving combustion such as delaying fuel injection timing. At present, it is essential to provide an exhaust gas aftertreatment device. This post-processing device has a filter for collecting particulates.

However, if the particulates are continuously collected, the filter is clogged, the flow of exhaust gas is deteriorated, and the engine output is reduced or the engine is stopped.

[0007] Therefore, technology development for regenerating the filter collection capacity is currently being promoted worldwide.
Ensuring durability performance is a major practical issue.

[0008] It is known that particulates burn at about 600 ° C. As means for generating energy for raising particulates to this high temperature range,
A burner method, an electric heater method, a microwave method, and the like have been considered.

The inventors of the present invention have developed a microwave type filter regenerating apparatus in consideration of good temperature rising efficiency, safety, ease of apparatus configuration, and good regenerative control.

Japanese Patent Application Laid-Open No. Sho 59-122022 discloses a microwave filter regenerating apparatus. FIG. 3 shows an apparatus disclosed in the publication. In the figure, 1 is an engine, 2 is an exhaust manifold, 3 is an exhaust pipe, 4 is an exhaust branch pipe, 5 is a filter, 6 is a heating chamber containing the filter 5, 7 is a microwave generating means, and 8 is a microwave generator. A waveguide for guiding the microwave generated by the means 7 to the heating chamber 6, 9 a microwave reflecting plate, 10 an air pump, 11 an air supply path, 12 a driving power source for the microwave generating means 7, 13 a muffler, 14 is an air switching valve, 1
Reference numeral 5 denotes an exhaust gas flow switching valve.

In the above configuration, the exhaust gas of the engine is guided to the filter 5 by the exhaust gas flow switching valve 15 or is directly discharged to the atmosphere. In the particulate collection cycle, the exhaust gas is guided to the filter 5 and the particulates contained in the exhaust gas are collected by the filter 5, but the collection capacity of the filter 5 is limited as described above. When the trapping capacity reaches the limit, the exhaust gas flow switching valve 15 is controlled, the exhaust gas to the exhaust pipe 3 is shut off, and all of the exhaust gas is exhausted to the atmosphere via the exhaust branch pipe 4. During this time, the regeneration of the filter 5 is performed. In this filter regeneration cycle, energy for heating the particulates is supplied from the microwave generation means 7 and air required for combustion is supplied from the air pump 10 at the same time. When the regeneration of the filter is completed after a predetermined time, the exhaust gas flow switching valve 15 is controlled again, and the exhaust gas is led to the filter 5. This cycle of collection and regeneration is repeated.

[0012]

However, the above-mentioned conventional apparatus has the following problems when heating and removing particulates collected by a filter.

This problem is caused by the particulate ignition region and the combustion progress direction. When the temperature of the particulates heated by the microwave generation means (heating means) reaches a combustible temperature level and shifts to a combustion state with the aid of a combustion assisting gas, the amount of heat generated per unit time generated by the burning of the particulates is determined by the heating means. This is considerably larger than the amount of heat supplied from the unit. For this reason, by supplying the calorific value of the particulate ignition region to the particulate collection region (region that has not yet reached the combustible temperature) subsequent to the ignition region, the region can be easily raised to the combustible temperature level. Can be. By utilizing the amount of heat generated by the combustion of the particulates themselves, it is possible to reduce the amount of energy supplied from the outside in performing the combustion of the particulates deposited on the entire filter. . However,
When the particulates are heated and burned using the combustion heat itself of such particulates, the temperature control of the combustion becomes almost impossible. In particular, when the total amount of particulates deposited on the filter is large, the filter may be in a combustion state in a temperature range where the filter exhibits mechanical destruction, or in the worst case, at a high temperature exceeding the heat resistant temperature of the filter substrate. Combustion state.

To summarize the conventional problems caused by these phenomena, the region where the particulate heated by the external energy supply reaches the combustible temperature level is a very limited region of the entire filter (usually the external energy supply). (A region near the side) and that the auxiliary combustion gas is supplied so as to transfer the combustion heat of the region that has reached the combustible temperature level to the particulate deposition space subsequent to this region. For this reason, there is a problem that the particulates cannot freely control the combustion temperature during the combustion, cannot shift to the high-temperature combustion, and causes mechanical damage to the filter.

The present invention has been made to solve the above-mentioned problems, and effectively heats and burns particulates, suppresses a high temperature during combustion, guarantees high filter regeneration performance, and guarantees filter durability. It is an object of the present invention to provide a filter regeneration device for an internal combustion engine and a control method thereof.

[0016]

In order to achieve the above object, the present invention provides an exhaust pipe for discharging exhaust gas from an internal combustion engine, and a particulate contained in the exhaust pipe and contained in the exhaust gas. A filter for collecting, heating means for heating the particulates from one end face side of the filter, and an auxiliary combustion for burning the heated particulates
Gas is allowed to flow from at least the other end side of the filter.
Control means for controlling the flow direction of the auxiliary combustion gas
Means for controlling the flow of the first auxiliary combustion gas.
The filter is supplied from the other end side of the filter.
Configuration.

[0017]

These devices are provided with an auxiliary gas flow temperature detecting means for detecting the temperature of the auxiliary gas after passing through the filter,
The flow of the auxiliary combustion gas is stopped based on the absolute level or the amount of change of the detection signal of the temperature detecting means. Also,
There is provided a trapping amount detecting means for detecting a particulate amount trapped in the filter. Further, the heating means is constituted by a microwave generating means.

[0019] an exhaust pipe for discharging exhaust gas of an internal combustion engine as a control method, and a filter for collecting particulate matter contained in exhaust gas is accommodated in the exhaust pipe, the feed from the one end face of the filter to Tsuryu was the particulates and microwave generating means for generating a microwave dielectric heating, the microwave power supply side filter end face direction from the other end face of at least the filter aid燃気body to burn the particulates described above dielectric heating a combustion support means, said in the configuration and control means for controlling the operation of the microwave generating means and burner air means, said control means at least the microwave feed in the filter
The particulate matter collected in the predetermined area on the end side is heated and burned.
Continuous operation of the microwave generation means to remove by burning
And the end face of the microwave feeding side filter
The operation of flowing the auxiliary combustion gas to the combustion chamber is controlled .

Further, the microwave feeding direction is on the exhaust gas discharge end face side of the filter, and the control means allows the auxiliary combustion gas to flow from the exhaust gas inflow end face of the filter toward the exhaust gas discharge end face, and the particulate residual area in the filter. Is reduced to less than half of the entire area of the filter, and the remaining particulates are dielectrically heated so that the auxiliary combustion gas flows from the exhaust gas discharge end of the filter in the direction of the exhaust gas inflow end face to burn off the remaining particulates. Is controlled.

[0021]

In the above construction, the flow of the particulate combustion assisting gas is made to flow in the direction of the filter end face side for heating the particulates, so that the particulates accumulate inside the filter of the combustion heat generated during combustion. Can be suppressed and transmitted to the outside of the filter, so that the expansion of the particulate combustion region can be suppressed and high-temperature combustion can be avoided.

The state of particulate combustion inside the filter can be confirmed by the temperature change detected by the auxiliary combustion gas flow temperature detecting means after the passage of the filter.
As a result, the flow of the supporting gas can be stopped at an appropriate timing, and if there is a residual area of the particulates, the residual area generated in the filter by the combustion of the particulates is used as a basis for the particles in the residual area. The curate can be efficiently heated and heated in a short time.

With the addition of the trapping amount detecting means, the flow of the particulate assisting gas is made to flow in the direction of the filter end face which heats the particulates according to the detected trapping level, thereby heating the particulates. By appropriately selecting and controlling the region to be burned and removed, it is possible to suppress a rise in temperature during particulate combustion.

At least a part of the particulate matter collected and remaining in the filter used in the control method, which is present in a predetermined area on the side of the microwave feeding end, is dielectrically heated by the microwave for a predetermined time, so that the particulate matter existing in the predetermined area is removed. At least reach the combustible temperature. Thereafter, the auxiliary combustion means is operated to cause the auxiliary combustion gas to flow in the direction of the end face of the microwave power supply side filter, so that the particulates present in at least a predetermined area are changed to a combustion state, and the particulates in the predetermined area are removed. The auxiliary combustion gas flow temperature detecting means is used as a means for determining whether or not the fuel gas has been removed. As soon as it is determined that the particulates have been removed, the operation of the auxiliary combustion means is stopped to accumulate combustion heat inside the filter, and if there are any remaining particulates, the heating of the particulates is continued. The residual particulates efficiently and quickly rise to a combustible temperature level in a short time due to heat accumulation in the filter.

When the microwave feeding direction is on the exhaust gas discharge end face side of the filter, it is difficult to effectively burn and remove particulates deposited on the exhaust gas inflow end face of the filter and the vicinity thereof. We know from experience that this is the case. In this case, in order to solve this problem, the control means allows the auxiliary combustion gas to flow from the exhaust gas inflow end of the filter toward the exhaust gas discharge end so as to reduce the particulate remaining area in the filter to の of the entire filter area.
The following control method is adopted as a method for burning the particulates remaining after the following. The remaining particulates are dielectrically heated to raise the temperature of the remaining particulates in the direction of the microwave power supply side to a combustible temperature level. Thereafter, the auxiliary combustion gas flows from the exhaust gas discharge end of the filter in the direction of the exhaust gas inflow end surface to burn and remove all remaining particulates. The particulates deposited on the exhaust gas inflow side end face of the filter and in the vicinity thereof are heated by using the combustion heat of the particulates remaining inside the filter to raise the temperature to a combustible temperature level and burn off. In this case, the combustion heat is used. However, since the combustion is performed at the end face of the filter and in the vicinity thereof, and the heat generated by the combustion is easily dissipated, it is possible to prevent the filter from being mechanically damaged.

[0026]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 16 denotes an exhaust pipe for discharging exhaust gas from an internal combustion engine (diesel engine) 17, reference numeral 18 denotes a heating space provided in the middle of the exhaust pipe 16, reference numeral 19 denotes an exhaust gas housed in the heating space. A filter having a honeycomb structure for collecting the particulates contained in the exhaust gas while passing through the filter. Reference numeral 20 denotes a microwave generating means (particulates) for generating microwaves to be supplied to a heating space for dielectrically heating the particulates. Heating means), 2
Reference numerals 1 and 22 denote linear and annular rectangular waveguides for transmitting the microwave generated by the microwave generating means 20 to the heating space, and 23 a power supply hole for feeding the microwave to the heating space.
Reference numeral 4 denotes an auxiliary means for supplying an auxiliary gas containing oxygen guided to the heating space in order to promote the combustion of the dielectrically heated particulates, and is constituted by a blower or a compressor. Reference numerals 25, 26, 27, and 28 are flow guide tubes for the auxiliary combustion gas supplied to the heating space.

Reference numeral 29 denotes an exhaust gas switching valve which allows the exhaust gas discharged from the internal combustion engine 17 to flow through the filter 19 or the exhaust branch pipe 30 when the filter 19 is regenerated. 31 is a muffler. 32, 33, 3
Reference numeral 4 denotes an auxiliary gas flow switching valve, which controls the direction of the auxiliary gas flowing through the filter 19 during filter regeneration.
Reference numerals 35 and 36 denote auxiliary combustion gas flow temperature detecting means for detecting the temperature of the auxiliary combustion gas flow which is passed through the filter 19 during filter regeneration and promotes the combustion of particulates after the passage of the filter. This detection signal is input to the control means 37.

The heating space 18 is provided with microwave shielding means 38, 3 having a punching hole configuration or a honeycomb configuration.
9, the space for substantially confining the microwave is limited. Reference numeral 40 denotes a heat insulating material provided between the outer periphery of the filter 19 and the filter support tube 41, which also serves as a filter support.

Reference numeral 42 denotes a trapping amount detecting means for detecting the amount of particulates trapped in the filter 19, which detects the intensity of the microwave electromagnetic field in the heating space 18 and detects the trapping amount based on the change. I have. This trapping amount detecting means 42
Is input to the control means 37. Control means 37
Controls the valves, the microwave generation means 20 and the auxiliary combustion means 24 to desired operating states when the collection amount reaches a predetermined collection amount or in accordance with the detected collection amount, and executes the regeneration of the filter 19.

The annular component 22 of the rectangular waveguide is the filter 1
A power supply hole 22 (one of which is not shown) provided facing the wall surface of the exhaust gas discharge pipe 43 from the end 9 is disposed at the end. Further, the annular rectangular waveguide has an E-plane T-branch structure, and is configured such that transmission line lengths from the branch portion to each power supply hole are substantially equal. In the vicinity of the connection between the annular rectangular waveguide and the linear rectangular waveguide, a structure 4 made of a microwave low-loss material for blocking the flow of exhaust gas is provided.
4 are provided.

The exhaust gas discharged from the internal combustion engine 17 flows through the exhaust pipe 16 and flows into the filter 19. The filter 19 is formed of a wall flow type honeycomb structure and has a function of collecting particulates contained in exhaust gas. When the amount of particulates collected by the filter 19 increases, the pressure loss of the filter 19 increases, the load on the engine, which is an internal combustion engine, increases, and in the worst case, the engine stops.

Therefore, it is necessary to remove the particulates collected by the filter 19 at an appropriate time. As a means for determining the appropriate time, other than the microwave electromagnetic field intensity detection method, the pressure loss level of the filter 19, the integrated value of the operating state of the engine, and the like can be used.
The particulate matter trapped in the filter 19 is removed by heating and burning. This process is called filter regeneration.

Next, FIG. 2 will be described. FIG. 2 shows a change in the state of particulate heating, combustion, and removal during filter regeneration in the apparatus configuration shown in FIG. 1 and shows the control contents of the auxiliary means in each state.

FIG. 2A shows the state of each valve while the exhaust gas is flowing through the filter 19. In addition, the accumulation state of the particulates collected by the filter 19 having the honeycomb structure is shown. (Shaded area in the filter) The distribution of the microwave electromagnetic field existing in the heating space changes according to the amount of particulates collected in the filter, but the amount of change is detected by the collection amount detecting means 42 and collected. Detect the amount. When the collection amount reaches a predetermined amount (or the same applies to the start of the reproduction by detecting the absolute amount of the collection amount), the regeneration of the filter is started.

At this time, each valve is controlled as shown in FIG. That is, the exhaust gas switching valve 29 is controlled so that the exhaust gas is distributed to the exhaust branch pipe 30 side and
Exhaust gas flow in the interior stops. When the microwave generating means (heating means) 20 is operated in this state, the filter 19
The particulates on the exhaust gas discharge end side in the filter are dielectrically heated more strongly by the microwaves supplied from the exhaust gas discharge end surface side. The time required for the heated particulates to reach the combustible temperature (about 600 ° C.) varies depending on the temperature of the filter 19, the amount of accumulated particulates, and the like, but the particulates that have reached the combustible temperature remain in the exhaust pipe. Burns slowly for air. However, in the time required to promote the combustion by supplying the auxiliary combustion gas, the combustion is not sufficiently promoted due to lack of oxygen, and the combustion region does not expand. The area where the particulates have reached the combustible temperature after an appropriate predetermined heating time has become に な る or more of the entire filter. In such a state, the auxiliary combustion gas flow valve 33
Is opened, and the auxiliary combustion means 24 is operated to allow the auxiliary combustion gas to flow from the exhaust gas inflow end face side of the filter 19 to the filter 19. The particulate heated by the flow of the auxiliary combustion gas immediately transitions to a combustion state. (Dark shaded area in the particulate existence area in FIG. 2B).

The temperature of the auxiliary combustion gas flow which accelerates the combustion is detected by the auxiliary combustion gas flow temperature detecting means 36. After the detection signal of the temperature detecting means 36 detects the maximum temperature value and a predetermined time has elapsed, the operation of the auxiliary combustion means 24 is stopped. As a result, the particulates deposited near the exhaust gas discharge end face side of the filter are burned and removed. (See FIG. 2 (c)). The passage time of the auxiliary combustion gas after the temperature detecting means 36 detects the maximum temperature value is set as short as possible within a range in which undesired unburned removal of the particulate does not occur. This has the effect of avoiding the dissipation of the heat accumulated in the filter 19 due to the burning of the particulates and efficiently raising the temperature of the particulates heated in the next stage.

Thereafter, the assisting gas flow switching valve 33 is controlled, and the assisting gas introducing pipe 27 is brought into the "closed" state. During this time, microwave power supply is continued. As a result, of the particulates remaining in the filter 19, those present on the microwave power supply side reach the combustible temperature level after a predetermined time has elapsed. (Dark shaded area in the particulate existence area in FIG. 2C). The subsequent control is the same as described above. By repeating these controls an appropriate number of times, the area of particulates remaining in the filter 19 is reduced to a predetermined area equal to or less than １ ／ of the entire filter.

When the particulates in the region located on the microwave power supply side in the remaining particulates are dielectrically heated and reach a combustible temperature level, the auxiliary gas flow switching valves 32, 33 and 34 are controlled as shown in FIG. 2 (d). Is done. When the combustion assisting means operates, the combustion assisting gas flows through the flow guide pipe 25 from the exhaust gas discharge end face side of the filter 19 into the filter to promote the combustion of the heated particulates, and then flows through the flow guide pipes 27 and 28 to the atmosphere. Is discharged. Filter 1
The temperature of the auxiliary combustion gas flow after 9 passages is detected by the auxiliary combustion gas flow temperature detecting means 35. The flow of the auxiliary gas flow is continued for a predetermined time after the auxiliary gas flow temperature detecting means 35 detects the maximum temperature value. In the flow of the auxiliary combustion gas flow, the remaining particulates are heated by the particulate combustion heat simultaneously with the dielectric heating by the microwave. The heat inside the filter is transmitted to the exhaust gas inflow end face of the filter 19, and the particulates accumulated near the exhaust gas inflow end face and the end face of the filter 19 are heated and heated to be burned and removed.

The filter 19 is controlled by the above-described auxiliary combustion gas flow control.
The particulates deposited in the inside are almost completely burned off. The operation of the microwave generation means 20 is stopped when the auxiliary combustion gas flow temperature detection means 35 detects the maximum temperature value.

The region where the particulates reach the combustible temperature level when the microwave generating means is operated for a predetermined time becomes narrower as the amount of trapped particulates in the filter increases. This is because, when the amount of trapped particulates increases, the degree of microwave absorption on the microwave feeding side increases, and the degree of microwave penetration equivalently decreases. For this reason, when the trapping amount increases, FIG.
By increasing the number of times of heating and removing particulates as shown in FIG. 2B or FIG. 2C, high-temperature combustion during particulate burning can be avoided. That is, as shown in FIG. 2 (b) or FIG.
The regeneration control according to the present invention employs a control method for selecting according to the collection amount collected in the nozzle 9. The trapping amount that can be burned and removed in one operation is determined by the trapping amount of the entire filter (equivalent to the trapping density per unit filtration area) and the power supply amount of the microwave.

By controlling the direction of flow of the auxiliary combustion gas as described above, the particulates remaining in the vicinity of the end face of the conventional filter can be removed by burning, so that the amount of unburned fuel in the filter can be minimized and the exhaust gas flow of the filter can be reduced. A sufficient flow area can be secured to maintain the collection performance of the filter, and at the same time, it is possible to prevent the particulate combustion temperature from increasing over a wide range of the collection amount, thereby eliminating mechanical damage to the filter. Thus, the durability of the filter can be guaranteed.

When the filter regeneration cycle ends, the auxiliary combustion means stops its operation and controls the auxiliary gas flow switching valve to its original state. After that, the exhaust gas can immediately flow into the filter 19 to collect particulates.

The structure of the means for transmitting the microwave to the heating space is not limited to the embodiment of the present invention.
For example, a coaxial transmission line can be used.

[0045]

As described above, according to the filter regeneration apparatus for an internal combustion engine and the control method thereof of the present invention, the following effects can be obtained.

(1) By allowing the direction of flow of the auxiliary combustion gas to flow toward the end face of the filter that heats the particulates, the combustion heat generated during the burning of the particulates can be dissipated to the outside of the filter. The expansion of the combustion region due to heat inside the filter can be suppressed, and high-temperature combustion can be avoided. Thereby, the mechanical damage of the filter can be eliminated.

(2) A means is provided for detecting the temperature of the auxiliary gas flow through the filter, and the flow of the auxiliary gas is stopped by the change in the detected temperature, so that the heat generated by the particulate combustion in the filter is reduced. It is possible to accumulate, and it is possible to efficiently raise the temperature by heating the particulates in the next stage, shorten the heating time, and save power for heating energy supplied from the outside.

(3) Based on the trapping amount detected by the trapping amount detection means, the heating and burning removal area of the particulate by the flow of the auxiliary combustion gas toward the filter end face for heating the particulate is appropriately selected and controlled. It is possible,
High temperature during particulate combustion can be suppressed over a wide range of trapped amount.

(4) A cycle in which a combustion assist gas is caused to flow in the direction of the end face of the filter to be heated to remove the particulates accumulated in a predetermined area by heating and burning is detected, and the remaining particulate area is １ ／ or less of the entire filter. By repeating the process up to an appropriate number of times according to the trapping amount, high-temperature combustion inside the filter at the time of filter regeneration can be eliminated.

(5) When the microwave power supply side is provided on the exhaust gas discharge end face side of the filter, if the remaining particulate region to be heated becomes less than half of the filter, the flow direction of the auxiliary combustion gas is changed to the direction of the exhaust gas filter. By controlling the flow in the opposite direction to the flow direction, the combustion heat of the remaining particulates is transmitted to the exhaust gas inflow end face of the filter and in the vicinity of the end face, and the heating of the particulates deposited near the exhaust gas inflow end face of the filter is promoted. Particulates in the region can be heated and removed, and a sufficient exhaust gas flow region in the filter can be ensured to maintain the trapping performance of the filter.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a filter regeneration device for an internal combustion engine showing one embodiment of the present invention.

FIG. 2 is a control state and combustion state transition diagram at the time of filter regeneration in the apparatus of FIG. 1;

FIG. 3 is a configuration diagram of a conventional filter regeneration device for an internal combustion engine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 16 Exhaust pipe 17 Internal combustion engine 19 Filter 20 Microwave generating means (heating means) 23 Power supply hole 24 Assisting means 35, 36 Assisting gas flow temperature detecting means 37 Control means 42 Collection amount detecting means

Continuation of the front page (56) References JP-A-4-203309 (JP, A) JP-A-4-66717 (JP, A) JP-A-59-165815 (JP, A) JP-A-59-126022 (JP, A) , A) (58) Field surveyed (Int. Cl. ⁶ , DB name) F01N 3/02 301-341

Claims (6)

(57) [Claims] An exhaust pipe for exhausting exhaust gas of an internal combustion engine,
A filter for collecting particulate matter contained in exhaust gas is accommodated in the exhaust pipe, a heating means for heating the particulates from the one end face of the filter, before
The auxiliary gas that burns the heated particulates
Auxiliary combustion flowing at least from the other end side of the filter
Means, and control means for controlling a flow direction of the auxiliary combustion gas;
The control means controls the flow of the first assisting gas
A filter regeneration device for an internal combustion engine, wherein the filter regeneration device is supplied from the other end side of the filter. 2. A method for detecting the temperature of the auxiliary combustion gas after passing through the filter, the control means comprising: means for detecting the temperature of the auxiliary combustion gas; 2. The filter regeneration device for an internal combustion engine according to claim 1, wherein 3. A filter regeneration device for an internal combustion engine according to claim 1, further comprising a trapping amount detecting means for detecting a particulate amount trapped in the filter. 4. A filter regeneration device for an internal combustion engine according to claim 1 , wherein said heating means is constituted by microwave generation means. 5. An exhaust pipe for discharging exhaust gas of an internal combustion engine, a filter housed in the exhaust pipe for collecting particulates contained in the exhaust gas, and an electric power supply from one end face side of the filter. Microwave generating means for generating microwaves for dielectrically heating the curate, and auxiliary combustion means for allowing the auxiliary combustion gas for burning the dielectrically heated particulates to flow from at least the other end face of the filter toward the end face of the microwave feeding side filter. , in the configuration and control means for controlling the operation of said microwave generating means and burner air means, said control means the fill
At least in a predetermined area on the microwave feeding end side
To burn and remove trapped particulates
While continuously operating the microwave generating means.
The auxiliary combustion air in the direction of the end face of the microwave power supply side filter
A control method of a filter regeneration device for an internal combustion engine, which controls a body flow operation . 6. The microwave feeding direction is on the exhaust gas discharge end face side of the filter, and the control means allows the auxiliary combustion gas to flow from the exhaust gas inflow end face of the filter to the exhaust gas discharge end face side so that the particulate remaining area in the filter is formed. Is reduced to less than half of the entire area of the filter, and the remaining particulates are dielectrically heated so that the auxiliary combustion gas flows from the exhaust gas discharge end of the filter in the direction of the exhaust gas inflow end face to burn off the remaining particulates. Claim 5
A control method for the filter regeneration device for an internal combustion engine according to the above .